“In sample we deal with …, in populations with…” | 1.) Statistics2.) parameters |

Which of the following provides a measure of central location for the data?a.) Standard deviation b.) Meanc.) Varianced.) Range | Mean |

A numerical value used as a summery measure for a sample, such as sample mean, is known as | Sample Statistics |

Since the population size is always larger than the sample size, then the sample statistic | can be smaller, larger, or equal to the population parameter |

μ is an example of | population parameter |

The median of a sample will always equal the | 50th percentile |

The median is a measure of | central location |

The 75th percentile is referred as the | Third quartile |

The pth quertial is a value such that at least p percent of the observation are | less than equal to this value |

The difference between the largest and the smallest data values is the | range |

The first quartile | Is the same as the 25th percentile |

Which of the following is not a measure of central location?a.)Mean b.) Medianc.) Varianced.) Mode | Variance |

If a data set has an even number of observation, the median | is the average value of the two middle item when all item are arranged in ascending order |

Which of the following is a measure of dispersiona.) Percentiles b.) Quartilesc.) Interquartile range d.) all of the above | interquartile range |

the most frequent occurring value of a data set is called the | mode |

The interquartile range is | the difference between the third quartile and the first quartile |

If index i (which is used to determine the location of the pth percentile) is not an integer, its value should be | rounded up |

When the data are skewed to the right, the measure of skewness will be | positive |

when data are positively skewed , the mean will usually be | greater than the median |

Which of the following is not a measure of dispersiona.) the rangeb.) the 50th percentialc.) the standard deviationd.) the interquartile range | the 50th percentile |

The range is used as a measure of variability to overcome what difficulty of the range? | the range influenced too much by extreme values |

If the variance of a data set is correctly computed with the formula using n-1 in the denominator | the data set is a sample |

In computing descriptive statistics from grouped data ( like frequency histogram) | data values are treated as if they occur at the midpoint of a class |

The measure of dispersion that is influenced most by extreme values is | the range |

When should measure of location and dispersion be computed from grouped data rather than from individual data values? | only when individuals data values are unavaliable |

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is | the standard deviation |

The measure of location which is the most likely to be influenced by extreme values in the data set is the | mean |

The most important statistical descriptive measure of the location of data set is the | mean |

The numerical value of the standard deviation can never be | negative |

The sample variance | could be smaller, equal to, or larger than the true value of the population variance |

The variance can never be | negative |

the sum of deviations of the individual data elements from their mean is | always equal to zero |

Standard deviation of the population | σ |

mean of the population | μ |

variance of the population | σ^2 |

size of the population | N |

mean of the sample | -X |

size of sample | N |

a numerical measure of linear associate between two variables | correlation coefficient of covariance |

positive values of covariance indicates | positive relation between the independent and the dependent variables |

the coefficient of correlation ranges between | -1 and +1 |

the coefficient of correlation | cannot be larger than 1 |

When the smallest and largest percentage of item are removed from data set and the mean is computed, the mean of the remaining data is | the trimmed mean |

during a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5). the variance of temp of the 10 days period | must be at least 0 |

which of the following is not a measure of dispersiona.) modeb.) Standard deviation c.) ranged.) interquartile range | mode |

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